*{margin: 0;padding: 0; list-style: none; text-decoration: none;} /*清除默认样式*/
        .frist{                            /*大盒子*/
            width: 100%;
            height: 680px;
            position: relative;
        }
        .frist header{                    /*标题*/
            width: 100%;
            height: 40px;
            background: #333;
        }
        .frist .con{
            width: 1030px;
            height: 40px;
            margin: 0 auto;
        }
        .frist header .left{
            width: 75px;
            height: 20px;
            background: url("images/logo.png") 0 0 no-repeat;
            margin-top: 10px;
            float: left;
        }
        .frist header .right{
            float: right;
            margin-top: 10px;
        }
        .frist header .con a{
            color: white;
        }
        .frist nav{                        /*黑色背景*/
            width: 100%;
            height: 80px;
            background: rgba(0,0,0,.2);
            border-bottom: 2px solid white;
            position: absolute;
            top: 40px;
            box-sizing: border-box;
        }
        .frist nav ul{
            width: 1030px;
            margin:0 auto;
            position: relative;
        }
        .frist nav ul a span{
            position: relative;
            top: -2px;
        }
        .frist nav ul a .img{
            position: relative;
            top:-5px;
        }
        .frist nav ul  a{                       /*登录 注册*/
            width: 100px;
            height: 90px;
            line-height: 90px;
            font-size: 20px;
            color: white;
        }
        .frist aside ol .left img{
            vertical-align: middle;
        }
        .frist nav aside{
            position: relative;
            left:-60px ;
            top: -10px;
            width: 340px;
            height: 550px;
            background: rgba(0,0,0,.3);
            opacity: 0;                        /*选项内容隐藏*/
            transition: .5s ease-in;
            z-index: 1;
        }
        .frist:hover nav aside{
            opacity: 1                        /*当碰到盒子时显示*/
        }
        .frist nav aside span{
            width: 20px;
            height: 14px;
            background: url("images/liebiao.png") no-repeat;
            position: absolute;
            left: 63px;
        }
        .frist aside ol{                        /*文字内容*/
            width: 155px;
            float: left;
        }
        .frist aside ol li{
            color: white;
            line-height: 26px;
        }
        .frist aside ol .h1{
            font-size:20px;
            padding: 10px 0 10px 0;
            
        }
        .frist aside .zuo{                        /*文字左边内容*/
            margin: 35px 0 0 60px;
        }
        .frist aside .you{                        /*文字右边内容*/
            position: absolute;
            top: 35px;
            left: 200px;
        }
        .frist aside img{
            position: absolute;
            left: 13px;
            bottom: 0;
        }
        .frist nav ul .center{
            position: absolute;
            top:25px;
        }
        .frist nav ul .center input{                /*搜索框*/
            position: absolute;
            left: 445px;
            width: 140px;
            height: 30px;
            color: white;
            border: 1.5px solid white;
            border-bottom: 0.5px solid white;
            border-radius: 15px;
            padding: 0 0 0 30px;
            background: url("../images/search.png") no-repeat 3px 2px;
            box-sizing: border-box;
        }
        .frist  nav ul .right{                /*右上角图标控制*/
            width: 300px;
            height: 90px;
            position:absolute;
            right: -100px;
            top: 20px;
        }
        .frist  nav ul .right a{                /*右上角图标*/
            display: inline-block;
            width: 35px;
            height: 35px;
            border: 1px solid;
            border-radius: 50%;
            line-height: 35px;
            text-align: center;
            font-size: 20px;
            color: white;
            font-family:"freshskin";
            margin-right: 20px;
            transition: .3s linear;
        }
        @font-face{                            /*引用图标文字*/
            font-family: "freshskin";
            src: url("../fonts/iconfont.ttf");
        }
        .frist  nav ul .right a:hover{        /*当碰到图标时 背景变白色*/
            background: black;
            color: white;
            transform: scale(1.3);
        }
        .frist .zhong{                            /*中间按钮*/
            width: 570px;
            height: 210px;
            background: url("images/wenzi.png") no-repeat center;
            position: absolute;                    /*居中*/
            left: 50%;
            top: 50%;
            transform: translate(-50%,-50%);
        }
        .frist .zhong p{                        /*文字居中*/
            font-size: 10px;
            margin-top: 240px;
            text-align: center;
        }
        .frist .zhong  ul{                    
            position: absolute;
            color: #999;
        }
        .frist .zhong ul li{
            margin: 20px;
            width: 190px;
            height: 56px;
            line-height: 56px;
            border: 1px solid;
            border-radius: 30px;
            background: white;
            text-align: left;
        }
        .frist .zhong ul .one,.two{                /*中间图标*/
            position: absolute;
            left: -1040px;
            top: 40px;
            cursor: pointer;
            transition: all .5s ease-in;
            opacity: 0;
        }
        .frist .zhong ul .two{                        /*靠标准左边为1300像素*/
           left: 1300px; 
        }
        .frist .zhong ul .one span,.zhong ul .two span{     /*图标里面内容*/
            width: 40px;
            height: 40px;
            border:1px solid;
            border-radius: 50%;
            text-align: center;
            line-height: 35px;
            font-size: 2em;
            float: left;
            margin: 8px 8px 0 10px;
            transition: all .5s ease-in;
        }        
        body:hover .frist .zhong ul .one,.two{        /*当碰到页面时*/
            position: absolute;
            left: 40px;
            top: 40px;
            opacity: .8;
        }
        body:hover .frist .zhong ul .two{               
            left: 300px;
            top: 40px;
        }
        .frist .zhong ul .one:hover span,.frist .zhong ul .two:hover span{            /*当碰到图标是  产生阴影效果*/
            box-shadow:inset 0 0 5px rgba(0,0,0,.5), 0 0 10px 2px rgba(0,0,0,.5);
        }
        video{                    /*背景动画*/
            position: relative;
            z-index: -999;
            width: 100%;
        }